Wii's Successor

The official announcement from nintendo! (Finally)

The formal unveiling of the new console, only known to be another home console, will come at E3 in June, and its release is said to be scheduled for April of 2012 .

Satoru Iwata, CEO of Nintendo said,

“We would like to propose a new approach to home video game consoles”
“It’s difficult to make 3-D images a key feature, because 3-D televisions haven’t obtained wide acceptance yet”

The Wii's successor, codenamed project cafe, the new Nintendo controller will feature dual analog sticks in addition to standard d-pad and trigger buttons. It'll mirror a Gamecube controller in general function but not in specific form.

Sources now confirm to IGN the new Nintendo controller allows players to stream entire games to the device from the console, saying it's like a miniature television. The screen size on the controller is also confirmed to be six inches in size.

Source : Bloomberg Japan
IGN
Wikipedia on Project Cafe